Low contribution of N2 fixation to new production and excess nitrogen in the subtropical northeast Atlantic margin
peer reviewed We used 15N-labeled substrates to measure dinitrogen (N2) fixation, nitrate and ammonium uptake, regeneration and associated dissolved organic nitrogen (DON) release in a coastal upwelling system (Cape Ghir, ∼31°N) and an open ocean grid (bounded between 25°–42°N and 20°W) in the Canar...
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ftorbi:oai:orbi.ulg.ac.be:2268/230479 2024-04-21T08:08:28+00:00 Low contribution of N2 fixation to new production and excess nitrogen in the subtropical northeast Atlantic margin Benavides, Mar Arístegui, Javier Agawin, Nona S. R. Álvarez-Salgado, Xosé Antón Álvarez, Marta Troupin, Charles 2013-07-18 https://orbi.uliege.be/handle/2268/230479 https://doi.org/10.1016/j.dsr.2013.07.004 en eng Elsevier http://www.sciencedirect.com/science/article/pii/S0967063713001386 urn:issn:0967-0637 urn:issn:1879-0119 https://orbi.uliege.be/handle/2268/230479 info:hdl:2268/230479 doi:10.1016/j.dsr.2013.07.004 scopus-id:2-s2.0-84881152982 restricted access http://purl.org/coar/access_right/c_16ec info:eu-repo/semantics/restrictedAccess Deep-Sea Research. Part I, Oceanographic Research Papers, 81 (0), 36-48 (2013-07-18) Nitrogen Canary Current Oceanography New production Upwelling Life sciences Biochemistry biophysics & molecular biology Sciences du vivant Biochimie biophysique & biologie moléculaire journal article http://purl.org/coar/resource_type/c_6501 info:eu-repo/semantics/article peer reviewed 2013 ftorbi https://doi.org/10.1016/j.dsr.2013.07.004 2024-03-27T14:53:43Z peer reviewed We used 15N-labeled substrates to measure dinitrogen (N2) fixation, nitrate and ammonium uptake, regeneration and associated dissolved organic nitrogen (DON) release in a coastal upwelling system (Cape Ghir, ∼31°N) and an open ocean grid (bounded between 25°–42°N and 20°W) in the Canary Current region during the summer of 2009. New production (Pnew= uptake+N2 fixation+DON released from uptake− regeneration) was higher in the upwelling than in the open ocean zone (0.126 and 0.014 µmol N L−1 h−1, respectively), while regenerated production (Preg= uptake+DON released from uptake+ regeneration) was similar in both zones (0.157 and 0.133 µmol N L−1 h−1, respectively). The resulting f-ratio (Pnew/Pnew+Preg) for the open ocean and upwelling zones was 0.08 and 0.48, respectively. The availability of nitrogen in excess of that expected from Redfield stoichiometry is generally attributed to N2 fixation. A previous study indicated that our open ocean grid zone had an excess nitrogen production rate of 40±22×1010 mol N yr−1. We revisited this budget including new dissolved organic matter and fluxes through the Strait of Gibraltar and estimated a revised nitrogen excess rate of 22±19×1010 mol N yr−1. The average volumetric rate of N2 fixation for this zone was only 1.3×10−3 nmol N L−1 d−1, indicating that its influence in Pnew and nitrogen excess production in this part of the Atlantic is negligible. CAIBEX Article in Journal/Newspaper Northeast Atlantic University of Liège: ORBi (Open Repository and Bibliography) Deep Sea Research Part I: Oceanographic Research Papers 81 36 48 |
institution |
Open Polar |
collection |
University of Liège: ORBi (Open Repository and Bibliography) |
op_collection_id |
ftorbi |
language |
English |
topic |
Nitrogen Canary Current Oceanography New production Upwelling Life sciences Biochemistry biophysics & molecular biology Sciences du vivant Biochimie biophysique & biologie moléculaire |
spellingShingle |
Nitrogen Canary Current Oceanography New production Upwelling Life sciences Biochemistry biophysics & molecular biology Sciences du vivant Biochimie biophysique & biologie moléculaire Benavides, Mar Arístegui, Javier Agawin, Nona S. R. Álvarez-Salgado, Xosé Antón Álvarez, Marta Troupin, Charles Low contribution of N2 fixation to new production and excess nitrogen in the subtropical northeast Atlantic margin |
topic_facet |
Nitrogen Canary Current Oceanography New production Upwelling Life sciences Biochemistry biophysics & molecular biology Sciences du vivant Biochimie biophysique & biologie moléculaire |
description |
peer reviewed We used 15N-labeled substrates to measure dinitrogen (N2) fixation, nitrate and ammonium uptake, regeneration and associated dissolved organic nitrogen (DON) release in a coastal upwelling system (Cape Ghir, ∼31°N) and an open ocean grid (bounded between 25°–42°N and 20°W) in the Canary Current region during the summer of 2009. New production (Pnew= uptake+N2 fixation+DON released from uptake− regeneration) was higher in the upwelling than in the open ocean zone (0.126 and 0.014 µmol N L−1 h−1, respectively), while regenerated production (Preg= uptake+DON released from uptake+ regeneration) was similar in both zones (0.157 and 0.133 µmol N L−1 h−1, respectively). The resulting f-ratio (Pnew/Pnew+Preg) for the open ocean and upwelling zones was 0.08 and 0.48, respectively. The availability of nitrogen in excess of that expected from Redfield stoichiometry is generally attributed to N2 fixation. A previous study indicated that our open ocean grid zone had an excess nitrogen production rate of 40±22×1010 mol N yr−1. We revisited this budget including new dissolved organic matter and fluxes through the Strait of Gibraltar and estimated a revised nitrogen excess rate of 22±19×1010 mol N yr−1. The average volumetric rate of N2 fixation for this zone was only 1.3×10−3 nmol N L−1 d−1, indicating that its influence in Pnew and nitrogen excess production in this part of the Atlantic is negligible. CAIBEX |
format |
Article in Journal/Newspaper |
author |
Benavides, Mar Arístegui, Javier Agawin, Nona S. R. Álvarez-Salgado, Xosé Antón Álvarez, Marta Troupin, Charles |
author_facet |
Benavides, Mar Arístegui, Javier Agawin, Nona S. R. Álvarez-Salgado, Xosé Antón Álvarez, Marta Troupin, Charles |
author_sort |
Benavides, Mar |
title |
Low contribution of N2 fixation to new production and excess nitrogen in the subtropical northeast Atlantic margin |
title_short |
Low contribution of N2 fixation to new production and excess nitrogen in the subtropical northeast Atlantic margin |
title_full |
Low contribution of N2 fixation to new production and excess nitrogen in the subtropical northeast Atlantic margin |
title_fullStr |
Low contribution of N2 fixation to new production and excess nitrogen in the subtropical northeast Atlantic margin |
title_full_unstemmed |
Low contribution of N2 fixation to new production and excess nitrogen in the subtropical northeast Atlantic margin |
title_sort |
low contribution of n2 fixation to new production and excess nitrogen in the subtropical northeast atlantic margin |
publisher |
Elsevier |
publishDate |
2013 |
url |
https://orbi.uliege.be/handle/2268/230479 https://doi.org/10.1016/j.dsr.2013.07.004 |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_source |
Deep-Sea Research. Part I, Oceanographic Research Papers, 81 (0), 36-48 (2013-07-18) |
op_relation |
http://www.sciencedirect.com/science/article/pii/S0967063713001386 urn:issn:0967-0637 urn:issn:1879-0119 https://orbi.uliege.be/handle/2268/230479 info:hdl:2268/230479 doi:10.1016/j.dsr.2013.07.004 scopus-id:2-s2.0-84881152982 |
op_rights |
restricted access http://purl.org/coar/access_right/c_16ec info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.dsr.2013.07.004 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
81 |
container_start_page |
36 |
op_container_end_page |
48 |
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1796948818800934912 |